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c#timerbackgroundworker

how to set timer_ticker to sleep until the process is completed in the background


I have a problem with timerTick() because it executes every 0.5 seconds, for me it's ok because he checks every 0.5 seconds for connectetCard(), now if so he should assign it The 5 seconds that I in _bw.DoWork assigned to run, how can I set timerTick() to fire again, but only when the process in backgroundWorker is completed.

This is my code:

public FormMenu()
        {
            InitializeComponent();

            SelectDevice();
            establishContext();
            timerBatch.Start();
            _bw = new BackgroundWorker
            {
                WorkerReportsProgress = true,
                WorkerSupportsCancellation = true
            };

        }   

private void timerBatch_Tick(object sender, EventArgs e)
        {
            if (connectCard())
            {
                cardUID = getcardUID();
                if (cardUID != "Error")
                {
                    using (DBEntities db = new DBEntities())
                    {
                        try
                        {
                            personData = db.Persons.Where(x => x.BATCH_ID == cardUID).FirstOrDefault();
                            if (maDaten == null)
                            {
                                labelInfo.Text = "Batch invalid.";
                                return;
                            }
                            else
                            {
                                person = db.Person.Where(x => x.LPE_ID == personData.MA_ID).FirstOrDefault();
                                _bw.DoWork += _bw_DoWork;
                                _bw.ProgressChanged += bw_ProgressChanged;
                                _bw.RunWorkerCompleted += bw_RunWorkerCompleted;
                                _bw.RunWorkerAsync();
                            }                         
                        }
                        catch (Exception es)
                        {
                            MessageBox.Show(es.Message);
                        }

                    };
                }
            }
        }

  private void _bw_DoWork(object sender, DoWorkEventArgs e)
        {
            for (int i = 5; i >= 0; i -= 1)
            {
                if (_bw.CancellationPending) { 
                    e.Cancel = true; return; 
                }
                if (i == 0)
                {
                    e.Cancel = true; return;
                }
                _bw.ReportProgress(i);
                Thread.Sleep(1000);
            }            
        }

   private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            labelInfo.Text = "Hello " + person.FirstName + " " + person.LastName + " " + e.ProgressPercentage.ToString();

        }

  private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            labelInfo.Text = labelInfo.Text.Trim();
        }

Solution

  • Try something like this:

    public FormMenu()
            {
                InitializeComponent();
    
                SelectDevice();
                establishContext();
                timerBatch.Start();
                _bw = new BackgroundWorker
                {
                    WorkerReportsProgress = true,
                    WorkerSupportsCancellation = true
                };
    
            }   
    
    //CHANGE:
    bool backgroundworkerRunning = false;
    
    private void timerBatch_Tick(object sender, EventArgs e)
            {
                //CHANGE:
                if (backgroundworkerRunning)
                  return;
    
                if (connectCard())
                {
                    cardUID = getcardUID();
                    if (cardUID != "Error")
                    {
                        using (DBEntities db = new DBEntities())
                        {
                            try
                            {
                                personData = db.Persons.Where(x => x.BATCH_ID == cardUID).FirstOrDefault();
                                if (maDaten == null)
                                {
                                    labelInfo.Text = "Batch invalid.";
                                    return;
                                }
                                else
                                {
                                    person = db.Person.Where(x => x.LPE_ID == personData.MA_ID).FirstOrDefault();
                                    _bw.DoWork += _bw_DoWork;
                                    _bw.ProgressChanged += bw_ProgressChanged;
                                    _bw.RunWorkerCompleted += bw_RunWorkerCompleted;
                                    //CHANGE:
                                    backgroundworkerRunning = true; 
                                    _bw.RunWorkerAsync();
                                }                         
                            }
                            catch (Exception es)
                            {
                                MessageBox.Show(es.Message);
                            }
    
                        };
                    }
                }
            }
    
      private void _bw_DoWork(object sender, DoWorkEventArgs e)
            {
                for (int i = 5; i >= 0; i -= 1)
                {
                    if (_bw.CancellationPending) { 
                        e.Cancel = true; return; 
                    }
                    if (i == 0)
                    {
                        e.Cancel = true; return;
                    }
                    _bw.ReportProgress(i);
                    Thread.Sleep(1000);
                }            
            }
    
       private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
            {
                labelInfo.Text = "Hello " + person.FirstName + " " + person.LastName + " " + e.ProgressPercentage.ToString();
    
            }
    
      private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
            {
                //CHANGE:
                backgroundworkerRunning = false; 
                labelInfo.Text = labelInfo.Text.Trim();
            }